With the estimation of the zero drift of accelerometer, the precision of the vertical velocity and height can be improved and the measurement of the acceleration can be got without zero drift.
该滤波器能够有效滤除海浪杂波的干扰，获得高质量的高度信号和垂向速度信号。
The measurement of flow quantity and velocity is the primary task of hydrological measurement, whereas it is much hard to design a meter with high precision and convenient usage.
河流流量和流速测量是水利测量的基础工作，然而设计测量精确而又使用方便的仪器比较困难。
The velocity measurement of 2-dimensional motion is realized through target radial moving information measured by two times range finding to improve the shooting precision.
由两次测距的目标径向运动信息，实现目标二维运动速度测量，改善射击精度。
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